Add dependencies for code generator

vendor/k8s.io/gengo/generator/import_tracker.go

@@ -0,0 +1,64 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package generator
+
+import (
+	"strings"
+
+	"k8s.io/klog"
+
+	"k8s.io/gengo/namer"
+	"k8s.io/gengo/types"
+)
+
+func NewImportTracker(typesToAdd ...*types.Type) namer.ImportTracker {
+	tracker := namer.NewDefaultImportTracker(types.Name{})
+	tracker.IsInvalidType = func(*types.Type) bool { return false }
+	tracker.LocalName = func(name types.Name) string { return golangTrackerLocalName(&tracker, name) }
+	tracker.PrintImport = func(path, name string) string { return name + " \"" + path + "\"" }
+
+	tracker.AddTypes(typesToAdd...)
+	return &tracker
+
+}
+
+func golangTrackerLocalName(tracker namer.ImportTracker, t types.Name) string {
+	path := t.Package
+
+	// Using backslashes in package names causes gengo to produce Go code which
+	// will not compile with the gc compiler. See the comment on GoSeperator.
+	if strings.ContainsRune(path, '\\') {
+		klog.Warningf("Warning: backslash used in import path '%v', this is unsupported.\n", path)
+	}
+
+	dirs := strings.Split(path, namer.GoSeperator)
+	for n := len(dirs) - 1; n >= 0; n-- {
+		// follow kube convention of not having anything between directory names
+		name := strings.Join(dirs[n:], "")
+		name = strings.Replace(name, "_", "", -1)
+		// These characters commonly appear in import paths for go
+		// packages, but aren't legal go names. So we'll sanitize.
+		name = strings.Replace(name, ".", "", -1)
+		name = strings.Replace(name, "-", "", -1)
+		if _, found := tracker.PathOf(name); found {
+			// This name collides with some other package
+			continue
+		}
+		return name
+	}
+	panic("can't find import for " + path)
+}